[PATCH 7/9] tools, perf: Make get_srcline fall back to sym+offset

From: Andi Kleen
Date: Thu Jul 31 2014 - 13:24:29 EST


From: Andi Kleen <ak@xxxxxxxxxxxxxxx>

When the source line is not found fall back to sym + offset.
This is generally much more useful than a raw address.
For this we need to pass in the symbol from the caller.
For some callers it's awkward to compute, so we stay
at the old behaviour.

Signed-off-by: Andi Kleen <ak@xxxxxxxxxxxxxxx>
---
tools/perf/util/annotate.c | 2 +-
tools/perf/util/callchain.c | 3 ++-
tools/perf/util/map.c | 2 +-
tools/perf/util/sort.c | 6 ++++--
tools/perf/util/srcline.c | 12 +++++++++---
tools/perf/util/util.h | 4 +++-
6 files changed, 20 insertions(+), 9 deletions(-)

diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 12997ff..363b0c1 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1187,7 +1187,7 @@ static int symbol__get_source_line(struct symbol *sym, struct map *map,
goto next;

offset = start + i;
- src_line->path = get_srcline(map->dso, offset);
+ src_line->path = get_srcline(map->dso, offset, NULL, false);
insert_source_line(&tmp_root, src_line);

next:
diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
index 8e75b35..efb1f4f 100644
--- a/tools/perf/util/callchain.c
+++ b/tools/perf/util/callchain.c
@@ -690,7 +690,8 @@ char *callchain_list__sym_name(struct callchain_list *cl,
cl->ms.map && !cl->srcline)
cl->srcline = get_srcline(cl->ms.map->dso,
map__rip_2objdump(cl->ms.map,
- cl->ip));
+ cl->ip),
+ cl->ms.sym, false);
if (cl->srcline)
printed = scnprintf(bf, bfsize, "%s %s",
cl->ms.sym->name, cl->srcline);
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index 31b8905..76910f8 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -359,7 +359,7 @@ int map__fprintf_srcline(struct map *map, u64 addr, const char *prefix,

if (map && map->dso) {
srcline = get_srcline(map->dso,
- map__rip_2objdump(map, addr));
+ map__rip_2objdump(map, addr), NULL, true);
if (srcline != SRCLINE_UNKNOWN)
ret = fprintf(fp, "%s%s", prefix, srcline);
free_srcline(srcline);
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index 58b4a92..9f49646 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -286,7 +286,8 @@ sort__srcline_cmp(struct hist_entry *left, struct hist_entry *right)
else {
struct map *map = left->ms.map;
left->srcline = get_srcline(map->dso,
- map__rip_2objdump(map, left->ip));
+ map__rip_2objdump(map, left->ip),
+ left->ms.sym, true);
}
}
if (!right->srcline) {
@@ -295,7 +296,8 @@ sort__srcline_cmp(struct hist_entry *left, struct hist_entry *right)
else {
struct map *map = right->ms.map;
right->srcline = get_srcline(map->dso,
- map__rip_2objdump(map, right->ip));
+ map__rip_2objdump(map, right->ip),
+ right->ms.sym, true);
}
}
return strcmp(right->srcline, left->srcline);
diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c
index ac877f9..36a7aff 100644
--- a/tools/perf/util/srcline.c
+++ b/tools/perf/util/srcline.c
@@ -8,12 +8,13 @@
#include "util/util.h"
#include "util/debug.h"

+#include "symbol.h"
+
#ifdef HAVE_LIBBFD_SUPPORT

/*
* Implement addr2line using libbfd.
*/
-#define PACKAGE "perf"
#include <bfd.h>

struct a2l_data {
@@ -250,7 +251,8 @@ void dso__free_a2l(struct dso *dso __maybe_unused)
*/
#define A2L_FAIL_LIMIT 123

-char *get_srcline(struct dso *dso, unsigned long addr)
+char *get_srcline(struct dso *dso, unsigned long addr, struct symbol *sym,
+ bool show_sym)
{
char *file = NULL;
unsigned line = 0;
@@ -289,7 +291,11 @@ out:
dso->has_srcline = 0;
dso__free_a2l(dso);
}
- if (asprintf(&srcline, "%s[%lx]", dso->short_name, addr) < 0)
+ if (sym) {
+ if (asprintf(&srcline, "%s+%ld", show_sym ? sym->name : "",
+ addr - sym->start) < 0)
+ return SRCLINE_UNKNOWN;
+ } else if (asprintf(&srcline, "%s[%lx]", dso->short_name, addr) < 0)
return SRCLINE_UNKNOWN;
return srcline;
}
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 6686436..0086323 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -318,8 +318,10 @@ unsigned long parse_tag_value(const char *str, struct parse_tag *tags);
#define SRCLINE_UNKNOWN ((char *) "??:0")

struct dso;
+struct symbol;

-char *get_srcline(struct dso *dso, unsigned long addr);
+char *get_srcline(struct dso *dso, unsigned long addr, struct symbol *sym,
+ bool show_sym);
void free_srcline(char *srcline);

int filename__read_int(const char *filename, int *value);
--
1.9.3

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